He started as an assistant coach on the bench of Big Power Ravenna Team between 1996 and 1997. He was again an assistant coach between 1998 and 2000 in Foppapedretti Bergamo Team and then in 2002–2003 season he started as a head coach with the Meccanica Pierre OML Mazzano, in Serie A2 (Italian second league) and was very close to winning the league.
Afterwards he transferred Robursport Scavolini Pesaro Team in first league, for 3 seasons which won the 2005-06 CEV Cup, and for 2 seasons in Monte Schiavo Banca Marche Jesi where he led the team to a playoffs in 2006–2007 league.
After he started coaching in Infidel Forlì Team in the 2008–09 season in Serie A2. He was subsequently hired by MC PietroCarnaghi Villa Cortese, a rookie in A1 in the 2009–10 season. He won the Italian Cup for two years consecutively and led the team to the playoffs finals in 2009–10, 2010–11 and 2011–12.
He was also a coach of the Italian national team at the World University Games.
The season 2016-17 is the 4th in Fenerbahce, and Marcello Abbondanza won the fifth title-winning the Turkish Cup in the Final Eight in Ankara, and this was the second time in his career, and he could defend the trophy from 2015 (tournament was not held in the season before).,[8] but this was not the only title in this season, because after an incredible comeback[9] in the golden set in the second semi-final of Turkish championship against Eczacıbaşı VitrA, Abbondanza won also for his second time in four years the Turkish League beating 3-0 the eternal rival Galatasaray in the Final.[10]
In January 2017, the Volleyball Canada announces Abbondanza as new women's head coach.[11]
In May 2017, the Volleyball Casalmaggiore announces their new head coach,[12] and Abbondanza come back to Italy after 5 years abroad.
After be suddenly fired after only one month at the beginning of the season from Pomì Casalmaggiore, he signed in February 2018 with the polish champions Chemik Police[14] until the end of the season, and he led the team to the gold medal.[15]
In the season 2017-18 Abbondanza sets a new record as the first coach to achieve nine championship finals in a row in four different countries. He started in the season 2009–10 in Italy, passing through Azerbaijan, Turkey and Poland.[20]